Good luck. Perhaps since aftermath and GR Turner so often answer for one and other, Mr/Ms Turner will share with us their thoughts on what OP may have been doing in the 15+ minutes between the shots (just after 3 am) and his first phone call, to Stander (3.19 am).
I didn't think anyone has really thought the first bangs were actually at 3 for some time. If they were then the Stipps just listened to it for around 15 minutes before calling security?? They also said what they were doing and it would surely not have taken 15 minutes.